Phenol Congo red staining is superior to the classical alkaline Congo red staining with respect to the detection of AA-amyloid deposits in biopsied abdominal fat tissue specimens. In addition to easy access and procedural safety, abdominal fat aspiration biopsy might contribute reliably to the diagnosis of systemic reactive AA amyloidosis secondary to RA when phenol Congo red staining is employed.
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Ishii et al. (2003) studied this question.
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